1. Department of Rehabilitation Medicine; The First Affiliated Hospital; Sun Yat-sen University; Guangzhou 510080 China
2. Guangdong Provincial Work Injury Rehabilitation Center; Guangzhou China
3. Psychology Department and Laurier Centre for Cognitive Neuroscience; Wilfrid Laurier University; Waterloo ON Canada
4. Department of Biomedical Engineering; School of Engineering; Sun Yat-sen University; Guangzhou China